<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>float.html</title>
 <link rel='stylesheet' href='../css/float.css'>
</head>
<body>
<div id='p1'>
       <div id="c1">c1</div>
       <div id="c2">c2</div>
       <div id="c3">c3</div>
       </div>
<div id='p2'>
           <div id="c4">c4</div>
           <div id="c5">c5</div>
           <div id="c6">c6</div>
           </div>
<div id='p3'>  
           <div id="c7">c7</div>
           <div id="c8">c8</div>
           <div id="c9">c9</div>            
</div>
</body>
</html>